microtech control panel · om 200micro 3 introduction this manual provides installation, setup and...

Operating Manual OM 200MICRO

Group: Chiller

Part Number: 585515Y

Effective: April 2000

Supersedes: OM125

© 1999 McQuay International

200-Series MicroTech Control Panel

For Centrifugal Chillers

2 OM 200MICRO

Table of Contents

Introduction......................................................................... 3

General Description ........................................................... 4General Description...........................................................................................4Control Panel Layout........................................................................................4Component Description ...................................................................................6

Keypad/Display Operation............................................... 13Menu Structure................................................................................................17

MicroTech Status Menus ................................................. 18

Control Menu Description ............................................... 24

Alarm Menus Description................................................ 38

Master/Slave Setup.......................................................... 41

Alarms ............................................................................... 43

McQuay" and MicroTech are registered trademarks of McQuay International1998 McQuay International

"Illustrations and information cover McQuay International products at the time of publication and we reserve the right to make changes indesign and construction at anytime without notice."

OM 200MICRO 3

Introduction

This manual provides installation, setup and troubleshooting information for the 200 SeriesMicroTech control panel for McQuay centrifugal chillers. Please refer to IOMM WSCWDC forinformation relating to the unit itself.

All operational descriptions contained in this manual are based on MicroTech control softwareversions CFG3E04I (English) and CFG3S04I (metric). Chiller operating characteristics and menuselections may vary with other versions of control software. Contact McQuayService for softwareupdate information.

Installation Precautions

WARNING

Electric shock hazard. Can cause personal injury or equipment damage. Thisequipment must be properly grounded. Connections to and service of the MicroTech

control panel must be performed only by personnel that are knowledgeablein the operation of the equipment being controlled.

CAUTION

Static sensitive components. A static discharge while handling electronic circuitboards can cause damage to the components. Discharge any static electrical charge

by touching the bare metal inside the control panel before performing any servicework. Never unplug any cables, circuit board terminal blocks, or power plugs while

power is applied to the panel.

NOTICE

This equipment generates, uses and can radiate radio frequency energy and, if notinstalled and used in accordance with this instruction manual, may cause

interference to radio communications. It has been tested and found to comply withthe limits for a Class A digital device, pursuant to part 15 of the FCC rules. Theselimits are designed to provide reasonable protection against harmful interferencewhen the equipment is operated in a commercial environment. Operation of this

equipment in a residential area is likely to cause harmful interference in which casethe user will be required to correct the interference at his own expense.

McQuay International Corporation disclaims any liability resulting from anyinterference or for the correction thereof.

Temperature and humidity considerationsThe MicroTech controller is designed to operate within an ambient temperature range of -40 to +149°F(-40 to +65.1°C) with a maximum relative humidity of 95% (non-condensing).

4 OM 200MICRO

General Description

General DescriptionThe MicroTech control panel contains a model 280 microprocessor based controller which provides allmonitoring and control functions required for the safe, efficient operation of the chiller. The operatorcan monitor all operating conditions by using the panel’s built in 4-line by 40-character keypad /display or by using an IBM compatible computer running McQuay Monitor software. In addition toproviding all normal operating controls, the MicroTech controller monitors all safety devices on theunit and will take corrective action if the chiller is operating outside of it’s normal design conditions.If a fault condition develops, the controller will shut the system down and activate an alarm output.Important operating conditions at the time an alarm condition occurs are retained in the controller’smemory to aid in troubleshooting and fault analysis.

The system is protected by a password scheme which only allows access by authorized personnel. Apassword must be entered into the panel keypad by the operator before any setpoints may be altered.

Control Panel LayoutFigure 1, Major Component Locations

TerminalBlock

Low Voltage Wireway

SignalConverter

SignalConverter

GuardisterBoard

GuardisterBoard

Low Voltage Wireway

Tran

sfor

mer

T3

Tran

sfor

mer

T4

AOXBoard

EXV

ModemLow Voltage Wireway

HighPress.Relay

HighPress.Relay

MCB 280OutputBoard

ADIBoard

Low

Vol

tage

Wire

way

Hig

h Vo

ltage

Wire

way

Term

inal

Blo

ck

Transformer

Circuit Breaker

OM 200MICRO 5

Features of the Control Panel

• Control of leaving chilled water within a±0.2°F (±0.1°C) control band.

• Readout of all temperature and pressurereadings:

− entering and leaving chilled watertemperature

− enter and leaving condenser watertemperature

− saturated evaporator refrigeranttemperature and pressure

− saturated condenser temperature andpressure - outside air temperature(optional)

− suction line, liquid line and dischargeline temperatures - calculatedsuperheat for discharge and suctionlines

− oil sump temperature - oil feedtemperature and pressure

− optional condenser heat recoverytemperature

• Automatic control of primary and**secondary evaporator and condenserpumps.

• Control of up to 4 stages of cooling towerfans plus modulating bypass valve.

• Panel mounted 12 key keypad plus 6 QuickAccess function keys. Operator can logchiller operating conditions from a singlekeypad/display instead of reading gauges,thermometers, pots, etc. The display is abacklit, 4 line by 40 character LCD type foreasy viewing in all lighting conditions.

• New auto-logging feature will automaticallylog chiller functions at the time of peak load.The controller will store and display up to sixweeks of accumulated data.

• Two levels of security protection againstunauthorized changing of set points andother control parameters.

• Complete warning and fault diagnostics toinform operators of warning and faultconditions in plain language. Al1 warnings,problems and faults are time and datestamped so there is no guessing of when thefault condition occurred. In addition, theoperating conditions that existed just prior to

shutdown can be recalled to aid in isolatingthe cause of the problem.

• Eight previous faults and related operatingconditions are available from the display.

• Soft loading feature reduces electricalconsumption and peak demand chargesduring loop pulldown.

• Adjustable load pull-down rate reducesunder-shoot during loop pulldown.

• Easy integration into building automationsystems via separate 4-20mAdc signals forchilled water reset and demand limiting.

• Internal time-clock for on/off scheduling. Thetime clock accommodates a 7 day scheduleplus holiday, 1 start and stop per day, and 14holidays with programmable duration.

• Communications capabilities for remotemonitoring, changing of set points, trendlogging, remote reset, alarm and eventdetection, via a compatible IBM-PC runningMcOuay MicroTech software.

• Manual control mode allows the servicetechnician to command the unit to differentoperating states. Useful for system checkout.

• BAS communication capability via McQuay'sOpen Protocol strategy to over 10 major BASmanufacturers.

• Service Test mode for troubleshootingcontroller hardware.

• Display available in either U.S.Customary orS.l. units. Keypad programmable alarmcontacts for normally open, or normallyclosed, and optional pulse output on problemand warning conditions.

• Pressure transducers for direct reading ofsystem pressures. Preemptive control of lowevaporator pressure conditions to takecorrective action prior to a fault trip.

• Preemptive control of high dischargetemperature.

• Modulating oil cooler valve control(optional).

• Minimum vane position set point.

• **Secondary throughout this publicationimplies a parallel or standby pump.

6 OM 200MICRO

Component Description

Microprocessor Control Board (MCB1)

The Model 280 Microprocessor Control Board

contains the electronic hardware and software

required to monitor and control the unit. It receives

input from the ADI Board and sends commands to

the Output Board to maintain the unit's optimum

operating mode for the current conditions. Status

lights are mounted on the control board to indicate

the operating condition of the microprocessor.

Pre-Start Checkout

Hexadecimal SwitchesFor proper chiller operation, each MicroTech controller must have a unique network address. Thecontroller’s hex switch settings define it’s location in a network as well as it’s unit type. For a stand-alone chiller, the Hi and Lo switches should be set to 0 and 1 respectively. After changing a hexswitch setting, the controller’s power must be cycled by opening, and then closing, the panel circuitbreaker.

Note: The chiller should be in an “Off” mode before resetting the hex switch positions.

Powering the Control PanelThere are three status LED’s located on the model 280 controller which will indicate themicroprocessor’s operating condition. When power is first applied to the control panel, the red resetLED will illuminate for approximately 3 seconds. During this time, the microprocessor is checking thecontrol software and performing internal hardware tests. When these tests are complete the reset LEDwill turn off and the green running LED will illuminate indicating the controller’s circuitry and softwareare operating correctly. The amber output 0 active LED is associated with the external alarm output.This LED may or may not be illuminated at this time based on the setpoints under menu 36.

Figure 3, Status LEDs

If the reset LED stays on or the running LED fails to illuminate, disconnect the controller power byopening circuit breaker CB-1 and re-check the field wiring. Observe the controller’s LED’s while re-connecting power by closing CB-1. If the green running LED still does not turn on, a hardware failureexists or the control software is corrupted. Downloading new control software or replacing the 280controller should correct the problem.

Figure 2, Model 280 MicroprocessorControl Board

green

red

amber

RUNNING

RESET

ACTIVE

CPUSTATUS

OUTPUT 0

OM 200MICRO 7

With the controller powered up and the green running LED illuminated, the backlite panel on thedisplay module will be illuminated and the unit status menu will be visible. If the display text looksfaded or appears as “blocks” the contrast control needs to be adjusted. Watch the display andadjusting the contrast control with a small flat-blade screwdriver until the best setting is determined.

Figure 4, Contrast Adjustment

KDI BOARD(back side)

PowerWiring

RibbonCable

ContrastAdjustment

The MicroTech controller contains factory installed default setpoints which will be appropriate formost common installations. Step through all of the unit’s setpoints by using the keypad / display andadjust them as required to meet the specific job requirements. Any faults appearing on the displayshould be cleared at this time by pressing the CLEAR key.

Digital Output BoardThe Output Board contains up to 24 solid state relays which are used to control the compressor,cooling tower fans, solenoid valves and alarm annunciation. It receives control signals from theMicroprocessor Control Board through a 50 conductor ribbon cable.

Figure 5, Digital Output Board

Digital OutputsSolid state digital relays are used to switch most of the external devices controlled by the MicroTechpanel. These devices may be pumps or solenoids that are either on or off.

8 OM 200MICRO

Table 1, Digital Outputs

No. Description LED Off LED On

0 Alarm LED and Contact Programmable Programmable

1 Unload Solenoid and Front Panel LED - Unload

2 Load Solenoid and Front Panel LED - Load

3 Motor Control Relay Off On

4 Motor Control Relay Latch Unlatched Latched

5 Oil Pump Off On

6 Oil Sump Heater Off On

7 Oil Cooler close Off On

8 Oil Cooler Open Off On

9 *Hot Gas Bypass Solenoid Off On

10 *Liquid Injection Off On

11 Cooling Tower #1 Off On




15 Evaporator Water Pump #1 Off On

16 Evaporator Water Pump #2 Off On

17 Condenser Water Pump #1 Off On

18 Condenser Water Pump #2 Off On

19 Spare

20 Spare

21 Spare

22 Spare

23 Spare

Analog/Digital Input Board (ADI)The ADI Board provides low voltage power for the temperature and pressure sensors. It alsoprovides optical isolation between the Microprocessor Control Board and all 24V switch inputs.LED's are furnished on the board to give a visual indication of the status of all digital inputs. Allanalog and digital signals from sensors, transducers and switches are received by the ADI Board andthen sent to the Microprocessor Control Board for interpretation.

Figure 6, ADI Board

Analog InputsAnalog inputs arriving at the ADI board are comprised of temperature, pressure, and flow signals. Inaddition, the chiller control panel mA receive chilled water reset and demand limit signals in the range

OM 200MICRO 9

of 4-20 mA. Temperature and pressure readings have a resolution of 0.1°F and 0.1 psi respectively.Flow readings and remote reset signals are resolved to ±1%.

10 OM 200MICRO

Table 2, Controller Input Signals

ADI Sensor No. Description Range

0 S00 Leaving Evaporator Water Temperature -40 - 263 F (-40-128.4°C)

1 S01 Entering Evaporator Water Temperature -40 - 263 F (-40-128.4°C)

2 S02 Compressor Suction Temperature -40 - 263 F (-40-128.4°C)

3 S03 External Chilled Water Reset (by others) 4-20mA = 0-100%

4 S04 External motor Current Reset (by others) 4-20mA = 0-100%

5 S05 Refrigerant Leak Monitor Signal (by others) 4-20mA = 0-100 PPM

6 S06 Evaporator Water Flow Transmitter Signal (by others) 4-20mA = 0-65535

7 S07 Condenser Water Flow Transmitter Signal (by others) 4-20mA = 0-65535

8 S08 Condenser Liquid Line Temperature -40 - 263 F (-40-128.4°C)

9 S09 Entering Condenser Water Temperature -40 - 263 F (-40-128.4°C)

10 S10 Leaving Condenser Water Temperature -40 - 263 F (-40-128.4°C)

11 S11 Percent Unit Amps 0-5V = 0-125% RLA

12 S12 Compressor Discharge Temperature -40 - 263 F (-40-128.4°C)

13 S13 Oil Feed Temperature -40 - 263 F (-40-128.4°C)

14 S14 Oil Sump Temperature -40 - 263 F (-40-128.4°C)

15 S15 Oil Vent Pressure 0-165 psig (0-1137.6 kPa)

16 S16 Evaporator Refrigerant Pressure 0-165 psig (0-1137.6 kPa)

17 S17 Condenser Refrigerant Pressure 0-165 psig (0-1137.6 kPa)

18 S18 Oil Feed Gauge Pressure 0-165 psig (0-1137.6 kPa)

19 S19 Transducer Power Voltage Ratio Used for Calibration

20 S20 Outdoor Air Temperature -40 - 263 F (-40-128.4°C)

21 S21 Heat Recovery Entering Water Temperature -40 - 263 F (-40-128.4°C)

22 S22 Heat Recovery Leaving Water Temperature -40 - 263 F (-40-128.4°C)

23 S23 Spare

Digital InputsDigital inputs indicate the status of external two-position devices such as a flow switch or remote timeclock. The ADI board senses the presence or absence of 24VAC and provides a correspondingindication to the microprocessor control board.

Table 3, Digital Inputs

No. Description Lo Voltage Hi Voltage

0 Front Panel "Stop/Auto" Switch Stop Auto

1 Compressor High Pressure Switch Alarm Normal

2 Motor High Temperature (Guardistor) Alarm Normal

3 Vanes Closed Open Closed

4 Starter Transition - Delta

5 Starter Fault Alarm Normal

6 Evaporator Water Flow Switch No Flow Flow

7 Condenser Water Flow Switch No Flow Flow

8 Remote Start/Stop Stop Enable

9 Chiller/Templifier/Ice Chiller Templifier/Ice

OM 200MICRO 11

Analog Output Board (AOX)The AOX board converts control instructions from the Microprocessor Control Board’s expansionbus into an analog control signal suitable for driving a cooling tower bypass valve. Each AOX boardis factory set via jumper to provide an output signal range of 0 - 10 VDC. An additional output on theAOX board provides an analog signal that is proportional to compressor motor current.

Figure 7, AOX Board

Analog Outputs (Optional)The analog outputs available at the AOX board provide a variable voltage used to control fieldmounted devices. The range of the output signal is jumper selectable: 0-10 VDC (default); 0-5 VDC; 4-20 mA.

Table 4, AOX Board #1

No. Description Conversion

0 Cooling Tower Bypass Valve 0-255 : 0-100% Open

1 Proportional Motor Current Output 0-255 : 0-100% RLA

2 *Compressor Variable Frequency Drive 0-255 : 0-100% Open

3 *Cooling Tower Variable Frequency Drive 0-255 : 0-100%

12 OM 200MICRO

Signal Converter BoardThe AC current signal generated by the starter is converted by the signal converter board into a 0-5VDC signal that is directly proportional to the chiller amp draw. The amp draw signal is sent to theADI board for conditioning and then to the M280 controller.

Figure 8, Signal Converter Board

TB1 TB2

Guardistor BoardThe Guardistor board monitors the motor winding temperature through the embedded Guardistorsensors. If the motor temperature rises to an unsafe level, the board will signal the M280 controllerand the chiller will be shut down.

Figure 9, Guardistor Board

Power TransformersTransformers T2, T3 and T4 provide operating power to the MicroTech controller and it’s associatedcomponents. T2 is a conventional ferrite core transformer that converts 120VAC from the controltransformer into 24VAC. T3 and T4 are transformers that convert 24VAC from T2 into a center-tapped18VAC.

OM 200MICRO 13

Keypad/Display Operation

The Keypad/Display is the primary operator interface to the unit. All operating conditions, systemalarms and setpoints can be monitored from this display and all adjustable setpoints can be modifiedfrom this keyboard if the operator has entered a valid operator password.

General DescriptionThe MicroTech keypad consists of eighteen pressure sensitive membrane switches used to stepthrough, access, and manipulate the information in the MicroTech controller. The selectedinformation is presented on a four line by forty character backlit LCD display.

The information stored in the MicroTech controller can be accessed through the keypad by followingthe tree-like structure of menus and menu items. The keypad keys are divided into four groups withfour or more keys in each to ease navigation through the available menus and items.

Figure 10, MicroTech Keypad

Alarm

Stop Auto

QUICK ACCESS

Status

Control Switch

Alarm

CATEGORY MENU - ITEM ACTION

Prev.Item

Prev.Menu

NextMenu

NextItem

+Incr.

HelpClear

Enter=

Decr.-

WaterSet-

points

MotorData Reports

OilTemps

Refrig.Temp’sPres’s

AlarmHistory

Load

Unload

Figure 11, Example of a typical MicroTech display screen indicating item lines andfields

3.Refrig Temps/Press 12:55 Mar-01-95Saturated Evap=50.7°F/46.2psi

Suct Line= 53.1°F Liq Line= 87.1°FSaturated Cond=90.8°F/105.9psi

Menu line

Item line 1

Item line 2

Item line 3

Field Two

Screen

Field One Next screen indicator

Previous screen indicator

14 OM 200MICRO

Category GroupThe keys in this group provide quick access to strategic menus throughout the menu tree-structure.This reduces the need to step through all the menus, one by one, in order to reach the desiredinformation.

Figure 12, Category Group

Status KeyMenus and menu items in this category provide information on the MicroTech operating conditionsand the chiller operating conditions. The entries under each menu item in this category provideinformation only and are not changeable through the MicroTech keypad.

Pressing the "STATUS" key at any time shifts the display to Menu #1 which is the first menu of theSTATUS category.

Control KeyMenus and menu items in this category provide for the adjustment of all the unit control parameters.These include capacity control, pump control and cooling tower control parameters as well as timeschedules and alarm limits. The entries under these menu items are changeable through theMicroTech keypad.

Pressing the "CONTROL" key at any time shifts the display to Menu #11 (Control Mode) which isthe first menu of the CONTROL category.

Alarm KeyMenus and menu items in this category provide information regarding current and previous faultconditions along with the operating temperatures and pressures at the time the fault occurred.

Pressing the "ALARM" key at any time shifts the display to Menu #27 which is the first menu of theALARM category.

Switch KeyPressing the "SWITCH" key at any time toggles the display between the current menu(Status/Control) item and the related menu (Control/Status) item somewhere else in the tree-structure. This allows checking actual conditions against setpoints. The status menu numbers thathave related control menus are 1, 2, 3, 6 and 7. The reciprocal occurs when in the control menu,pressing the "SWITCH" key toggles to the related status menu showing actual conditions. Thecontrol menu numbers that have related status menus are 11, 12, 18, 19 and 22. Pressing the“SWITCH” key the second time takes the operator back to the original menu item. For example, if thiskey is pressed while the current menu item is menu item 2B (Leaving Evaporator =), the displayshifts to menu item 12B (Local Evaporator Setpoint =). This provides for easy review of actualversus setpoint values.

OM 200MICRO 15

Menu - Item Group

Figure 13, Menu - Item Group

The keys in this group are used to scroll through the various menus and items presented on thecontroller’s display. A menu contains a specific group of items.

Note: When Menu #1 is currently in the display (the first menu in the menu tree-structure), pressing"PREV." causes an "beginning of menus" message to appear in the display.

Previous MenuPressing "PREV." shifts the display to the previous group of items within a menu. Note: When the firstitem in a menu is currently in the display, pressing "PREV." causes an "beginning of items" messageto appear in the display.

Next MenuPressing "NEXT" shifts the display to the next group of items in a menu. Note: When the last item ina menu is currently in the display, pressing "NEXT" causes and "end of items" message to appear inthe display.

Previous ItemPressing "PREV." shifts the display to the previous group of items within a menu. Note: When thefirst item in a menu is currently in the display, pressing "PREV." causes an "beginning of items"message to appear in the display.

Next ItemPressing "NEXT" shifts the display to the next group of items in a menu. Note: When the last item ina menu is currently in the display, pressing "NEXT" causes and "end of items" message to appear inthe display.

Action Group

The keys in this group are for making changes to unit controlparameters or for clearing fault conditions.

Note: Before a change to a parameter can be made or before a faultcan be cleared, the display prompts the user with an "EnterPassword" message. At this point, the password must be enteredbefore the user can continue with the action.

Prev.Item

NextItem

Prev.Menu

NextMenu

+Incr.

HelpClear

Enter=

Decr.

-

16 OM 200MICRO

Increment (+)When changing the value of a menu item entry, pressing ''INCR. +" shifts the selected menu item tothe next higher value or next available selection.

Decrement (-)When changing the value of a menu item entry, pressing "DECR.-" shifts the selected menu item tothe next lower value or previous available selection.

Enter (=)Once a change has been made to a desired value, pressing "ENTER =" locks in the new value.

Help / ClearPressing "ALARMS" followed by "CLEAR" clears the current fault. Also, when a change is made toa menu item, pressing "CLEAR" returns the display to the original value as long as "ENTER" has notyet been pressed. Note: The cause of a fault should always be determined and corrected beforeclearing the fault through the keypad.

Keypad PasswordWhen changing any menu item entry (+ or- key), the user is prompted to enter a valid password. Thechange will not be allowed until the correct password is entered. The password for centrifugal units isalways four successive presses of the "Enter" key.

Once this has been done, the user can make changes to menu item entries. After entering the correctpassword, the controller will allow a 5 minute time period during which the operator may make anynecessary setpoint adjustments. Any keypad activity will reset the timer for the full 5 minutes so thepassword only needs to be entered once per session. After 5 minutes of inactivity, the passwordaccess time will expire providing protection against unauthorized users.

Quick Access GroupThe quick access keys provide a fast shortcut directly into the most frequently used MicroTechmenus. For example, pressing the "WATER SET POINTS" key moves you directly to menu #12without having to step through intermediate menus via the "PREVIOUS" and "NEXT" keys.

Figure 14, Quick Access Group

Display FormatThe information stored in the MicroTech controller tree structure can be viewed directly on thecontrol panel's 4 line by 40 character display. The currently selected menu is shown on the top linealong with the current date and time. Up to six menu items may be shown on the lower three lines ofthe display. Alarm menus may have an additional field on line 1.

Either English or Metric units of measure may be displayed by installing the appropriate controllersoftware.

WaterSet-

points

MotorData Reports

OilTemps

Refrig.TempsPress's

OilTemps

OM 200MICRO 17

English Customary Units:Temperature = ºF (Fahrenheit)Pressure = Psi (Pound per sq. inch)

PsigPsid

Metric Units:Temperature = ºC (Centigrade)Pressure = kPa (Kilo Pascals)

kPagkPda

Menu Structure

Displaying SetpointsTo view set points or operating conditions press the "PREV MENU" or "NEXT MENU" key untilmenu of interest appears. (Remember pressing a key in the Category group goes to the first menu ofthat group.) To view additional set points or conditions under the menu selected press the "PREVMENU" or "NEXT MENU" key.

Changing SetpointsSet points/values that can be modified are under the control and alarm categories. Once the menu isselected, the set point/value can be changed by pressing the "+ INCR." or "- DECR." key. Thedisplay screen will change and in place of the date and time the term "ENTER PASSWORD:" will bedisplayed. The operator must enter the appropriate password by pressing the correct four keys insequence. The display will indicate "PASSWORD VERIFIED:" or ''INVALID PASSWORD:" in place ofthe time and date. When the correct password is entered, the term "<Change Values Mode>" isdisplayed in place of the time and date. The first value on the display that can be changed will flashon and off. Pressing the "NEXT/ PREV MENU" or "NEXT/PREV ITEM" keys will select the next setpoint/value on the screen that can be changed. Pressing the "+ INCR." or "- DECR." key will changethe numeric value or select the next option. When the correct value or option is flashing, press the"ENTER =" key to store it into memory. The flashing will stop and the time and date is returned to thedisplay screen. Follow this sequence to change additional set points/values. (The term "EnterPassword" will not be displayed unless there has not been any keypad activity for flve minutes.)

Display ScreenThe display screen is divided into lines and fields. The top line will indicate the menu number and amenu description on the left side, and the time and date on the right side. The time and date will bereplaced with directions when modifying set points and values.

The first line normally will have two fields except when viewing alarms then there is a third field. Line2 and line 3 have two fields. Different menus will have varying amounts of information and not all thefields will be used.

When selecting new menus using the "NEXT MENU" and "PREV MENU" keys, the display isconsidered screen one. If additional screens are available, there will be a arrow pointing down in thelast block in the right hand screen corner. To obtain additional information available under a specificmenu, press the "NEXT ITEM" and "PREV ITEM" keys. This will toggle between the availablescreens displaying the various set points and values. Most menus will have only one screen;however, Menu 10 (Auto Logging) has 24 screens. The range of information that can be displayed ina field is extensive and the next section will show all possible field names, set points and values.

18 OM 200MICRO

MicroTech Status Menus

Press the "STATUS" key under the Category Group and the information in Menu 1 (Unit Status) willbe displayed. Information displayed in menus 1-10 indicates current operating conditions and cannotbe reset from the display keypad. Refer to the Metric Menu section for displays in metric values.This menu has one screen with three lines of information. Line 1 contains the unit operating status infield 1 and the motor % amps in field 2. Line 2, field 1 indicates the entering evaporator watertemperature and line 2, field 2 indicates the entering condenser water temperature. Line 3, field 1indicates the leaving evaporator water temperature and line 3, field 2 indicates the leaving condenserwater temperature. This information gives the operator a quick view of the operating condition of theunit. Pressing the switch key will toggle between this menu and Menu 11 (Control Mode). Thisallows the operator to compare actual operating status versus control mode.

Menu 1, Unit StatusItem

Screen Line Display Field Range Extended NameAllSystemsOff

Off: AlarmOff: Ambient LockoutOff: Front Panel Sw

Off: Remote ContactsOff: Remote CommOff: Time Schedule

Off: Manual SetpointOff: System Comm

Start RequestedWaiting Low Sump T

Evap Pump OffWaiting For LoadCond Pump OffCond Pump OnMCR Started

MCR Off: Rapid ShtdnMCR Off: Routn Shtdn

Evap Pump OffRunning: Hi Disch TRunning: Lo Evap TRunning: Soft LoadRunning: Max Pulldn

Running: Rem Amp LimRunning: Man Amp LimRunning: Net Amp LimRunning: Manual LoadRunning: Max Amp LimRunning: Min Amp Lim

Load RecyclePre-Lube

Start UnloadPost-Lube

Evap Pump on-RecircOil Pump On-Prelube

Startup UnloadingRunning OK:

Shutdown Unloading

Running: Spt 44.0°F 1

Post Lube

Chiller Operating Mode1

Motor Amps=xx%RLA 2 1-100% Motor CurrentEnt Evap=xx.x°F 1 Entering Evap Water Temp

2Ent Cond=xx.x°F 2 Entering Cond Water TempLvg Evap=xx.x°F 1 Leaving Evap Water Temp

1

3Lvg Cond=xx.x°F 2 Leaving Cond Water Temp

Press the "NEXT MENU" key and Menu 2 (Water Temps/Flow) will be displayed. This menu has twoscreens. Screen 1, line 1, field 1 indicates the entering evaporator water temperature and line 1, field 2indicates entering condenser water temperature. Line 2, field 1 indicates the leaving evaporator water

OM 200MICRO 19

temperature and line 2, field 2 indicates the leaving condenser water temperature. Line 3, field 1indicates the evaporator delta temperature. This is the difference between the entering and leavingwater temperature and indicates the 'load' on the chiller and the performance of the chiller. Line 3, field2 indicates the condenser delta temperature. The design delta temperature of the evaporator andcondenser should be recorded. Any large changes in the delta temperatures is an indication ofpotential problems that could be associated with fouled condenser or evaporator tubes.

Press the "NEXT ITEM" key and screen 2 will display additional information. Line 1, field 1 willindicate the entering heat recovery temperature. (This is an optional operating parameter and it willdisplay a value only if the optional heat recovery sensors are installed.) Line 1, field 2 will indicatethe flow rate through the evaporator in gallons per minute (gpm). (This is an option and the optionalflow meter must be installed in the piping system.) Line 2, field 1 indicates the leaving heat recoverywater temperature (optional). Line 2, field 2 indicates the condenser water flow in gallons per minute(optional). Line 3, filed 1 indicates the delta temperature of the heat recovery system (optional). Thedelta temperature of the heat recovery system multiplied by the water flow rate and a special factorwould provide the amount of heat recovered in Btu's. This information could be compared to designconditions to determine system operation. Pressing the switch key will toggle between this menu andMenu 12 (Leaving Evap Set Points) . This allows the operator to compare actual operating conditionsversus set points.

Menu 2, Water TemperaturesItem

Screen Line Display Field Range Extended NameEnt Evap=xx.x°F 1 Entering Evap Water Temp

1Ent Cond=xx.x°F 2 Entering Cond Water TempLvg Evap=xx.x°F 1 Leaving Evap Water Temp

2Lvg Cond=xx.x°F 2 Leaving Cond Water TempDelta T=xx.x°F 1 Evap Water Delta Temp

1

3Delta T=xx.x°F 2 Cond Water Delta Temp

Ent Ht Rcvy=xx.x°F 1 Heat Recvy Ent Water Temp1

Evap Flow=xxxxgpm 2 Averaged Evap Water FlowLvg Ht Rcvy=xx.x°F 1 Heat Recv Lvg Water Temp

2Cond Flow=xxxxgpm 2 Averaged Cond Water Flow

2

3 Delta T=xx.x°F 1 Heat Rcvy Delta Temp

Press the "NEXT MENU" key and Menu 3 (Refrig Temps/Press) will be displayed. This menu hasthree screens. The refrigerant temperatures and pressures allows the operator to determine if thechiller is performing properly. These values should be recorded in a chiller log on a daily basis. Thevalues will change as the load, condenser temperature and evaporator temperature vary. The operatorshould be able to correlate displayed information to varying load conditions.

Screen 1, line 1, field 1 indicates the saturated evaporator refrigerant pressure and temperature. Theevaporator pressure is measured using a pressure transducer and the associated temperature iscalculated using refrigerant tables stored in the computer memory. Line 2, field 1 indicates thesaturated condenser refrigerant pressure and temperature. The condenser pressure is measured usinga pressure transducer and the associated temperature is calculated. Line 3, field 1 indicates thesuction line temperature. This is measured with a thermister in the inlet suction pipe before the inletguide vanes at the compressor. Line 3, field 2 indicates the liquid line temperature and is measuredwith a thermister in the liquid line leaving the condenser.

Press the "NEXT ITEM" key and screen two will display additional information. Screen 2, line 1, field1 indicates the suction superheat. This value is determined by subtracting the saturated evaporatortemperature from the suction line temperature. Line 1, field 2 indicates the amount of subcooling ofthe liquid refrigerant. This temperature is calculated by subtracting the liquid line temperature fromthe condenser temperature. Line 2, field 1 indicates the refrigerant temperature after it leaves thecompressor and before entering the condenser. Line 2, field 2 indicates the condenser approachtemperature. This temperature is calculated by subtracting the leaving condenser water temperaturefrom the saturated condenser refrigerant temperature. Line 3, field 1 indicates the discharge refrigerantsuperheat. This temperature is calculated by subtracting the refrigerant saturated condensertemperature from the refrigerant discharge temperature. Line 3, field 2 indicates the evaporator

20 OM 200MICRO

approach temperature. This temperature is calculated by subtracting the evaporator refrigeranttemperature from the evaporator leaving water temperature.

Press the "NEXT ITEM" key and screen 3 will display additional information. Line 1, field 1 indicatesthe compressor lift pressure. This value is calculated by subtracting the evaporator pressure from thecondenser pressure. This indicates the work by the compressor.

Menu 3, Refrigerant Temps/PressItem

Screen Line Display Field Range Extended Name1 Saturated Evap=xx.x°F/xx.xpsi 1 Saturated Refg Evap Temp/Press

2 Saturated Cond=xx.x°F/xx.xpsi 1Saturated Refg Cond

Temp/PressSuct Line=xx.x°F 1 Suction Line Refg Temp

1

3Liquid Line=xx.x°F 2 Liquid Line Refg Temp

Suct Suprht=xx.x°F 1 Suction Superheat1

SubCool=xx.x°F 2 Liquid SubCoolingDischarge=xx.x°F 1 Discharge Temp

2Cond Apprch=xx.x°F 2 Condenser Approach TempDsch Suprht=xx.x°F 1 Discharge Superheat

2

3Evap Apprch=xx.x°F 2 Evap Approach Temp

1 Lift Press=xx.xpsi 1 System Lift Pressure3

2 Lift Temp=xx.x°F 1 System Lift Temperature

Press the "NEXT MENU" key and Menu 4 (Motor Amps) will be displayed. Menu four has onescreen. Line 1, field 1 indicates the percent rated load amps. This value is calculated by comparingmeasured run amps with a full load amp value entered by the start-up technician. Line 2, field 1indicates the actual motor amps as measured by a current transformer on one leg of the compressorwiring. Line 3, field 1 indicates the amp limiting value if limiting is being enforced by the controlsoftware. Pressing the switch key will toggle between this menu and Menu 13 (MotorAmp SetPoints) . This allows the operator to compare actual operating conditions versus set points.

Menu 4, Motor AmpsItem

Screen Line Display Field Range Extended Name1 % Rated Ld amps=xx.x% 1 Percent Rated Load Amps2 Motor Amps=xxxx 1 Actual Motor Amps13 Limit=xxx 1 Effective Amp Limiting

Press the "NEXT MENU" key and Menu 5 (Oil Temperatures) will be displayed. Menu five has onescreen. Line 1, field 1 indicates the oil vent pressure as measured with a pressure transducer in the oilsump housing. Line 1, field 2 indicates the oil temperature in the oil sump as measured with athermister located in the oil sump housing. Line 2, field 1 indicates the oil feed pressure as measuredby a pressure transducer in the oil line of the oil pump discharge. Line 2, field 2 indicates thetemperature of the oil as measured by a thermister in the oil line after the oil cooler. This is thetemperature of the oil that is supplied to the compressor for lubrication. Line 3, field 1 indicates thenet oil pressure as calculated by subtracting the evaporator pressure from the oil feed pressure. Thisindicates the actual oil pump pressure. Pressing the switch key will toggle between this menu andMenu 21 (Oil Set Points) . This allows the operator to compare actual operating conditions versus setpoints.

Menu 5, Oil TemperatureItem

Screen Line Display Field Range Extended NameVent Press=xx.xpsi 1 Oil Vent Pressure

1Sump Temp=xx.x°F 2 Oil Sump TempFeed Press=xx.xpsi 1 Oil Feed Pressure

2Feed Temp=xx.x°F 2 Oil Feed Temp

1

3 Net Press=xx.xpsi 1 Oil System Net Pressure

OM 200MICRO 21

Press the "NEXT MENU" key and Menu 6 (Pump Status) will be displayed. Menu six has one screen.Line 1, field 1 displays the evaporator pump running status. Line 1, field 2 displays the condenserpump running status. Line 2, field 1 indicates which evaporator pump is operating as the lead pump.Line 2, field 2 indicates which condenser pump is operating as the lead pump. Pressing the switch keywill toggle between this menu and Menu 18 (Pump Set Points) . This allows the operator to compareactual operating conditions versus set points.

Menu 6, Pump StatusItem

Screen Line Display Field Range Extended NamePumps Off

Pmp #1 StartPmp #2 StartPump #1 OnPump #2 On

Evap 1

Pumps Fail

Evaporator Pump Status

Pumps OffPmp #1 StartPmp #2 StartPump #1 OnPump #2 On

1

Cond 2

Pumps Fail

Condenser Pump Status

Pmp #1 Currently Selected Lead PumpEvap Lead= 1

Pmp #2Pmp #1 Currently Selected Lead Pump

1

2Cond Lead= 2

Pmp #2

Press the "NEXT MENU" key and Menu 7 (Tower Status) will be displayed. Menu seven has twoscreens. Screen 1, line 1, field 1 indicates the current cooling tower stage in operation. This isoptional and will be valid only if the chiller is controlling the cooling tower fans. Line 2, field 1indicates the entering condenser water temperature. Line 3, field 1 indicates the cooling tower by-pass valve position. This is optional and will be valid only if a cooling tower valve is controlled bythe chiller. Screen 2, line 1, field 1 indicates the outdoor air temperature. This is optional and will bevalid if an out door thermistor is installed. Pressing the switch key will toggle between this menu andMenu 19 (Cooling Tower Control). This allows the operator to compare actual operating conditionsversus set points.

Menu 7, Tower StatusItem

Screen Line Display Field Range Extended Name1 Cooling Tower Stage=x Current Cooling Tower Stage2 Ent Condenser Water Temp=

1-4Entering Condenser Water Temp

13

Cooling. Tower Bypass ValvePos=xxx%

10-100%

Cooling Tower Bypass ValvePosition

2 1 Outdoor Air=xx.x°F 1 Outdoor Air Temp

Press the "NEXT MENU" key and Menu 8 (Operating Hours) will be displayed. Menu eight has twoscreens. Line 1, field 1 indicates the total compressor operating hours. Line 1, field 2 indicates thenumber of compressor starts. Line 2, field 1 indicates time of the last compressor start. Line 2, field 2indicates the date of the last compressor start. Line 3, field 1 indicates the time of the last compressorstop. Line 3, field 2 indicates the dates of the last compressor stop. Screen 2, line 1, field 1 indicatesthe run hours of number one evaporator pump. Line 1, field 2 indicates the run hours of number onecondenser pump. Line 2, field 1 indicates the run hours of number two evaporator pump. This isoptional and requires a second evaporator pump controlled by the chiller. Line 2, field 2 indicates therun hours of the second condenser pump. This is optional and requires a second condenser pumpcontrolled by the chiller.

22 OM 200MICRO

Menu 8, Operating HoursItem

Screen Line Display Field Range Extended NameComp Hours=xxxxx 1 Compressor Operating Hours

1Starts=xxxx 2 Compressor Starts

1 Time of Last Chiller Start2 Last Start=xx:xx mm/dd/yy

2 Date of Last Chiller Start1 Time of Last chiller Stop

1

3 Last Stop=xx:xx mm/dd/yy2 Date of Last Chiller Stop

Evap Pmp #1=xxxx 1 Evap Pump #1 Run Hours1

Cond Pmp #1=xxxx 2 Condenser Pump #1 Run HoursEvap Pmp #2=xxxx 1 Evaporator Pump #2 Run Hours

22

Cond Pmp #2=xxxx 2 Condenser Pump #2 Run Hours

Press the "'NEXT MENU" key and Menu 9 (Network Status) will be displayed. Menu nine has onescreen. This menu is only accessible when you have two series 200 MicroTech panels and one hasbeen configured as a master. This menu only displays on the master MicroTech. The slaveMicroTech will not have Menu 9.

Line 1, field 1 displays the active master command status. Line 1, field 2 indicates which chiller is thelead unit. Designation is master or slave. Line 2, field 1 indicates the command to the slave chiller.Line 2, field 2 displays the lead lag configuration. Line 3, field 1 indicates the communication statusbetween the master and slave unit. Pressing the switch key will toggle between this menu and Menu23 (Lead Lag Setup). This allows the operator to compare actual operating conditions versus setpoints. Menu 23 is only available on the master chiller when a network exists between two 200 SeriesMicroTech chillers. A network can be established between two single (PE) compressor chillers or one(PF) dual compressor chiller. The values 'Recr' and 'Auto' will display only if there is a CSC panelproviding central control.

Menu 9, Network StatusItem

Screen Line Display Field Range Extended NameStopAutoRecr

Master Commands 1

Run

Active Master Command

Master

1

Lead Unit= 2Slave

Control Panel Definition

StopAutoRecr

Slave Commands 1

Run

Active Slave Command

Lead&Lag OffLead OnLag On

2

Status= 2

Lead&Lag On

Lead/Lag System

No Comm

1

3 Comm Status= 1Comm OK

Status of Cummunication Link

Press the "NEXT MENU" key and Menu 10 (Auto Logging) will be displayed. Menu ten has twenty-four screens. There are four screens per log, therefore, there are six weeks of log information. TheMicroTech will automatically record the information listed in screens 1 through 4 (referred to theactive window) at the time of the highest peak percent run load amps. The first weeks information(active window) will be saved in a buffer then cleared to accept the next weeks information. The startday and start time along with the end day and time is configured in Menu 24 (Service). Due to thelength of the screens, only the first eight are presented. These indicate the active window (currentweek) and previous week of information.

OM 200MICRO 23

Menu 10, Auto LoggingItem

Screen Line Display Field Range Extended Name1 Wk Ending 1 Date of Current Log

Peak=xxx% 1 Recorded Peak % RLA2

Evap=xx.xxpsi 2 Recorded Evaporator Pressuremm-dd xx:xx 1 Date and Time of Log Entry

1

3Cond=xxx.xpsi 2 Recorded Condenser Pressure

Ent Evap=xx.x°F 1 Recorded Ent Evap Water Temp1

Ent Cond=xx.x°F 2 Recorded Ent Cond Water TempLvg Evap=xx.x°F 1 Recorded Lvg Evap Water Temp

2Lvg Cond=xx.x°F 2 Recorded Lvg Cond Water Temp

Evap Aprch=xx.x°F 1 Recorded Evap Approach

2

3Cond Aprch=xx.x°F 2 Recorded Cond ApproachDischarge=xx.x°F 1 Recorded Discharge Temp

1SubCool=xx.x°F 2 Recorded Subcooling

Dsch Suprht=xx.x°F 1 Recorded Discharge Superheat3

2Suct Suprht=xx.x°F 2 Recorded Suction Superheat

1 Sump Temp=xx.x°F 1 Recorded Oil Sump TempFeed Temp=xx.x°F 1 Recorded Oil Feed Temp

2Evap Flow=xx.x°F 2 Recorded Evap Water Flow

Feed Press=xx.xpsi 1 Recorded Oil Feed Pressure4

3Cond Flow=xxxxpgm 1 Recorded Cond Water Flow

1 Wk Ending 1 Date of Previous LogPeak=xxx% 1 Recorded Peak % RLA

2Evap=xx.xpsi 2 Recorded Evap Pressuremm-dd xx:xx 1 Date and Time of Log Entry

5

3Cond=xxx.xpsi 2 Recorded Cond Pressure

Ent Evap=xx.x°F 1 Recorded Ent Evap Water Temp1

Ent cond=xx.x°F 2 Recorded Ent Cond Water TempLvg Evap=xx.x°F 1 Recorded Lvg Evap Water Temp

2Lvg Cond=xx.x°F 2 Recorded Lvg Cond Water Temp

Evap Aprch=xx.x°F 1 Recorded Evap Approach

6

3Cond Apprch=xx.x°F 2 Recorded Cond Approach

Discharge=xx.x°F 1 Recorded Discharge Temp1

Subcool=xx.x°F 2 Recorded SubcoolingDsch Suprht=xx.x°F 1 Recorded Discharge Superheat

72

Suct Suprht=xx.x°F 2 Recorded Suction Superheat1 Sump Temp=xx.x°F 1 Recorded Oil Sump Temp

Feed Temp=xx.x°F 1 Recorded Oil Feed Temp2

Evap Flow=xxxxgpm 2 Recorded Evap Water FlowFeed Press=xx.xpsi 1 Recorded Oil Feed Pressure

8

3Cond Flow=xxxxgpm 2 Recorded Cond Water Flow

24 OM 200MICRO

Control Menu Description

Press the "CONTROL" key under the 'Category Group' and Menu 11 (Control Mode) will bedisplayed. Menus 11-26 are the control menus. All control set points and value selections are enteredinto the MicroTech from these menus. The default set point is indicated under the display columnand the range of set points or values are indicated in the range column. The service technicianresponsible for start-up will input all necessary set points and select the proper values for the chillerto operate.

Warning!

Improper set points or values can cause erratic chiller operation and damageto the chiller. Please use caution whenever changing set points or values.

Menu 11 has one screen. This menu is password protected and requires the operator password. Theoperational mode selected will control the chiller as described below until the value is changed.

Menu 11, Control ModeItem

Screen Line Display Field Range Extended NameService TestingManual EnableAuto: NetworkAuto: Local

1 1 Mode= 1

Manual Off

SelectedUnit Operation

Manual Off—This mode causes the chiller to stop. If the unit is operating, it will go through acontrolled shutdown and remain off. If the unit is off, it will remain off.

Auto:Local—This mode allows the chiller to operate according to it's internal MicroTech set points.Chiller operation will start if the remote start/stop input is made, internal time clock calling foroperation and front panel switch set to the auto position.

Auto:Network—This mode will control the chiller from a remote panel such as a Chiller SystemController (CSC). A network implies two or more 200 series controllers connected to a level 1 device.

Manual Enable—This mode allows the chiller to operate if the front panel switch is set to auto. TheMicroTech will ignore the remote start/stop input and the internal time clock schedule.

Service Testing—This mode shuts down the chiller and the chiller is in the manual off mode. Menu25 (Service Testing) allows the service technician to check the individual outputs and calibrate theselected transducers.

Press the "NEXT MENU" key and menu 12 (Leaving Evap Set Points) will be displayed. Menu 12has three screens. This menu is password protected and requires the operator password.

OM 200MICRO 25

Menu 12, Leaving Evap Set PointsItem

Screen Line Display Field Range Extended NameLocal Lvg Set Point Source

Spt Source=Local 1Network1

Active Spt=xx.x°F 2 Current Active Set PointLocal Spt=44.0°F 1 40-80 User Adjustable Chw Set Point

2Startup DT=3.0°F 2 1-10 Startup Delta Temp

Network Spt=xx.x°F 1 Chw Spt Supplied by Network

1

3Shutdn DT=3.0°F 2 1-3 Shutdown Delta Temp

No ResetReturn4-20mA

OATChw Reset=No Reset 1

Ice

Chw Reset Method1

Max Lvg Spt=54.0°F 2 10-80 Upper Chw Set Point LimitReturn Spt=54.0°F 1 20-80 Set point for Return Water Reset

2No Reset at 70°F 2 10-90 Lower OAT Reset Limit

Reset Signal=xx.xmA 1 0-20mA External Reset Signal Amplitude

2

3Max Reset At=50°F 2 10-90 Upper OAT Reset Limit

3 1 Pulldn Rate=0.5/m 1 0.1-5.0 Maximum Chw Pulldown Rate

Spt Source= The value selected determines the source for the set point.

Auto:Local—Will allow the chiller to use it's internal set point selected in this menu screen 1, line2 (local spt). Local is also the selection if a master/slave arrangement exists between two 200series controllers for the purpose of lead/lag control and load balance control.

Auto:Network—Will control the chiller from a remote panel such as a Chiller System Controller(CSC). A network implies two or more 200 series controllers connected to a level 1 device.

Active Spt= This is a status value and cannot be changed. Active spt indicates the current set point(factoring in any reset signals) that is controlling the chiller and can be used to determine if the chilleris maintaining leaving chilled water temperature set point.

Local Spt= This is the actual chilled water leaving temperature for the chiller to maintain if there is nota network. Local spt is active depending upon which set point source was selected. A value must beentered into local spt. This is the default value used to control the chiller if a network communicationfailure occurs.

Startup Dt= This value is added to the active spt set point. When the chiller is waiting for load andthe water circulating through the evaporator exceeds the active spt plus the startup dt, the chiller willstart operation. Example: active spt = 44, startup dt = 10, the chiller will start when the watertemperature exceeds 54.

The startup dt along with the shutdn dt can be used to reduce cycling of the chiller.

Network Spt= This value cannot be adjusted. It is the value supplied by the network if a networkexists. The active spt can be compared to the local spt and network spt to determine which set pointis controlling the chiller.

Shutdn Dt= This value is subtracted from the active spt. When the leaving chilled water temperaturereaches this calculated value, the chiller will shutdown. Example: active spt = 44, shutdn dt = 4, thechiller will shutdown when the water temperature leaving the evaporator is less than 40.

The shutdn dt along with the startup dt can be used to reduce cycling of the chiller.

Chw Reset= There are several methods that can be selected to reset the leaving evaporator chilledwater temperature.

No Reset—This does not provide any reset and is the default value.

Return—This measures the evaporator return water temperature and as the return comes backcooler (indicating cooling load is reduced) the leaving water temperature is increased. Thisreduces motor amps and provides an operational cost savings.

26 OM 200MICRO

4-20mA—This is an optional input to the MicroTech. This input is usually from a buildingautomation system.

As the input changes from 4 to 20 mA, the leaving chilled water temperature is increased fromlocal spt (in a linear manner) until the max lvg spt is reached. When the spt source is set tonetwork, the 4-20 mA input is supplied to the master MicroTech control. The master will issuereset instructions to the slave MicroTech. Upon network communication failure the slave unitwill revert back to local spt control. Network failure on a dual machine will require immediateattention.

Oat—The leaving water temperature set point is increased as the outside air temperaturedecreases. The leaving water temperature set point will be reset upward from the local spt to themax lvg spt (in a linear manner) between the max reset and no reset values. The outside airtemperature can be used to determine when the building load will decrease because of cooleroutside air temperatures. Since the building load is reduced the leaving evaporator watertemperature can be increased providing reduced operational costs.

Ice—This option allows the chiller to operate at temperatures that are required by ice banks. Iceoption requires an external 24 vac input to change the chiller from regular operation to iceoperation. The local spt should be set to equal the ice temperature plus the shutdn dt. The maxlvg spt would determine the normal or day operating temperature. All refrigerant set points mustbe adjusted according to the operating temperatures and pressures.

Max Lvg Spt= This is the highest leaving water temperature allowed when using return, 4-20 or oatreset. This is the day or normal operating temperature if ice is selected as a reset option. If this setpoint is set to high it can cause the compressor to surge and damage the chiller.

Return Spt= This value will control the MicroTech if the chw reset option was set to return. Whenthe return water temperature reaches return spt the leaving evaporator water temperature will beincreased to maintain the return spt. The leaving water temperature will not exceed the max lvg spt.

No Reset At—A value must be entered if oat was selected as the chw reset option. Select an outsideair temperature to stop the reset option.

Reset Signal= The actual value of the external reset signal.

Max Reset At—A value must be entered if oat was selected as the chw reset option. Select an outsideair temperature at which the maximum reset will occur.

Pulldn Rate= This value will determine how fast the MicroTech will allow the chiller to reach local spt.The maximum allowable change in the chilled water temperature in degrees per minute. Compressorloading will be inhibited if the rate of change is exceeded.

Press the "NEXT MENU" key and menu 13 (Motor Amp Set Points) will be displayed. Menu 13 has 2screens. This menu is password protected and requires the operator password.

Menu 13, Motor Amp Set PointsItem

Screen Line Display Field Range Extended NameNo Reset

Amp Reset=No Reset 1Demand Limit

Current Limit Method1

Active Spt=0% 2 Active Amp Limit Set PointReset Signal=0.0mA 1 0-20mA Magnitude of External Signal

2Min Amp Spt=40% 2 20-80% Minimum Amp Limit ValueNetwork Spt=xx% 1 Network Amp Limit Value

1

3Max Amp Spt=100% 2 40-100% Maximum Amp Limit Value

1 Soft Load=Off 1 Off-On Soft Load Active2 Begin Amp Lim=40% 1 20-100% Initial Soft Load Value23 Ramp Time=5Min 1 1-60Min Soft Load Ramp Timer

Amp Reset= The value selected determines the type of motor amperage control.

No Reset—Allows the MicroTech to control chiller motor amperage depending on chiller load,high and low limits and from manual input.

OM 200MICRO 27

Demand Limit—Allows the MicroTech to control chiller motor amperage based on a remote 4-20mA signal supplied by a building automation system input. The 4-20 mA signal limits thecapacity of the chiller and saves electrical demand charges.

Active Spt= This is a status value and cannot be changed. Active spt indicates the set point that iscontrolling the chiller. If current limiting is active, the maximum allowable percent of RLA will bedisplayed. It is a diagnostic aide when compared to the max amp spt value.

Reset Signal= A status value indicating the reset signal (in milliamps) currently being applied.

Min Amp Spt= A value must be entered even if the demand limit option was not selected. This is theminimum amperage (low limit) of the demand limit option and (low limit) for normal chiller operation.The chiller will not unload below this value.

Network Spt= This value cannot be adjusted (0-100%). It is the value supplied by the network level1 controllers.

Max Amp Spt= This value has priority over demand limit and network spt. This should be themaximum operational amperage of the unit. Normal set point would be 100. This value can be used tolimit the operational amperage should abnormal conditions exist.

Soft Load= This value activates the soft load (ramp up) option if set to on. Upon chiller start, softload takes over control when the chiller amperage is equal to the begin amp km and loads up over theramp time to the max amp spt.

Begin Amp Lim= A value must be entered if the soft load option was set to on. Select an amperagevalue that allows the chiller to start and establish proper operating conditions. This will eliminatenuisance start up trips.

Ramp Time= The default ramp time is usually adequate; however the soft load time can be extendedup to 60 minutes.

Press the "NEXT MENU" key and menu 14 (Set Time/Date) will be displayed. Menu 14 has onescreen. This menu is password protected and requires the operator password.

These values must be set in the menu to allow MicroTech to control start/stop and holiday functions.MicroTech will not start the chiller until this menu is completed.

Menu 14, Set Time DateItem

Screen Line Display Field Range Extended Namehh:mm:ss 1 00:00:00-23:59:59 Current Hour, Min, Sec

day 2 Sun-Sat Current Day1 1mm-dd-yy 3 Jan-Dec, 1-31,00-99 Current Date

Press the "NEXT MENU" key and menu 15 (Schedule) will be displayed. Menu 15 has two screens.This menu is password protected and requires the operator password.

28 OM 200MICRO

Menu 15, ScheduleItem

Screen Line Display Field Range Extended NameOverride=00.0Hr 1 00.00-63.75 Manual Schedule Override

1Network Sched= 2 1-32 Network Time ScheduleSun 00:00-23:59 1 00:00-23:59 Sunday Run Schedule

2Tue 00:00-23:59 2 00:00-23:59 Tuesday Run ScheduleMon 00:00-23:59 1 00:00-23:59 Monday Run Schedule

1

3Wed 00:00-23:59 2 00:00-23:59 Wednesday Run ScheduleThu 00:00-23:59 1 00:00-23:59 Thursday Run Schedule

1Sat 00:00-23:59 2 00:00-23:59 Saturday Run ScheduleFri 00:00-23:59 1 00:00-23:59 Friday Run Schedule

2Hol 00:00-23:59 2 00:00-23:59 Holiday Run Schedule

1 Jan-Dec2 00-31

2

3 One Event N/A-00:00-23:593 00:00-23:59

Time Schedule Override

0verride= This allows the operator (manual input) to input a time value that the MicroTech will ignorethe normal or holiday start/stop schedule. This timed override will start when the value is entered.

Network Sched= Network schedules can be provided through a network master panel when the Mode(menu 11) is set to auto:network. If a master/slave arrangement is active, the master panel will controlthe schedule. The slave unit should be programmed the same as the master to have consistentoperation should the network communications fail.

Sun thru Fri—The start time (first value) and stop time for each day of the week should be entered.The default value (00:00-23:59) allows the chiller to operate continuously.

Hol—The time entered at this menu will control the chiller nun time for the holiday dates entered inmenu 16 (holiday date).

One Event—This is a one time schedule which will allow the chiller to operate on the month, day andtime specified. This allows a special override time to be set in advance instead of using the Overrideas described above.

Press the "NEXT MENU" key and menu 16 (Holiday Date) will be displayed. Menu 16 has threescreens. This menu is password protected and requires the operator password. Screen one has 1-6,screen two has 7-12 and screen three has 13-14 holiday dates. The first screen is shown fordescription purposes. The month, day and number of days in the holiday is selected. The start andstop time was selected in menu 15 (Schedule).

Menu 16, Holiday DateItem

Screen Line Display Field Range Extended Name1 Jan-Dec Holiday Month2 00-31 Holiday Date#1=N/A-00 00 Day(s)3 00-31 Duration Days1 Jan-Dec Holiday Month2 00-31 Holiday Date

1

#4=N/A-00 00 Day(s)3 00-31 Duration Days1 Jan-Dec Holiday Month2 00-31 Holiday Date#2=N/A-00 00 Day(s)3 00-31 Duration Days1 Jan-Dec Holiday Month2 00-31 Holiday Date

2


1

3

#6=N/A-00 00 Day(s)3 00-31 Duration Days

Table Continued

OM 200MICRO 29

Table 16 ContinuedItem

Screen Line Display Field Range Extended Name1 Jan-Dec Holiday Month2 00-31 Holiday Date#7=N/A-00 00 Day(s)3 00-31 Duration Days1 Jan-Dec Holiday Month2 00-31 Holiday Date

1


2


2

3

#12=N/A-00 00 Day(s)3 00-31 Duration Days1 Jan-Dec Holiday Month2 00-31 Holiday Date1 #13=N/A-00 00 Day(s)3 00-31 Duration Days1 Jan-Dec Holiday Month2 00-31 Holiday Date

3

2 #14=N/A-00 00 Day(s)3 00-31 Duration Days

Press the "NEXT MENU" key and menu 17 (Timers) will be displayed. Menu 17 has one screen. Thismenu is password protected and requires the operator password.

Menu 17, TimersItem

Screen Line Display Field Range Extended Name1 Start-Start=15Min 1 15-60 Min Start to Start Delay Timer2 Evap Recirc=15Sec 1 15 Sec-5 Min Chilled Water Recirculation Timer13 Stop-Start=3Min 1 3-20 Min Stop to Start Delay Timer

Start-Start= This value determines the minimum time between chiller starts. The chiller must run thetime selected before it will start again. If the chiller runs less that the time selected the timer will haveto time out before another start is allowed. This is to eliminate chiller cycling that could damage themotor by starting to frequently.

Evap Recirc= This value determines the time the chilled water pump must run before the startsequence is started. This value insures that the chilled water system has an adequate load to start thechiller. It also insures that the chilled water pump has time to establish constant flow in the system toprevent nuisance water flow switch trips.

Stop-Start= This value is similar to the Start-Start already described. This time insures that there isadequate time between stop to start for the chiller to become stable or pressures to equalize. This canalso be used to minimize short cycling.

Press the "NEXT MENU" key and menu 18 (Pump Set Points) will be displayed. Menu 18 has onescreen. This menu is password protected and requires the operator password.

30 OM 200MICRO

Menu 18, Pump Set PointsItem

Screen Line Display Field Range Extended NamePmp 1 OnlyPmp 2 OnlyAuto Lead#1 Primary

1 Evap=Pmp 1 Only 1

#2 Primary

Evap Pump Selection Mode

Pmp 1 OnlyPmp 2 OnlyAuto Lead#1 Primary

1

2 Cond=Pmp 1 Only 1

#2 Primary

Cond Pump Selection Mode

Evap= This value determines how the pumps will be controlled by the MicroTech. The controlling ofthe pump (s) is optional.

Pmp 1 Only—The pump designated as number 1 will be started and the second pump (number 2)will not be started if number 1 fails.


Auto Lead—The MicroTech will try and balance the operating hours between the two pumps bystarting the pump with the least amount of run time. In case of pump failure, the MicroTech willstart the next pump.

#1 Primary—The number 1 pump will be started each time with number 2 as a standby. If pump 1fails the standby pump will be started.


Cond= This value determines how the pumps will be controlled by the MicroTech. The controlling ofthe pump (s) is optional.



Auto Lead—The MicroTech will try and balance the operating hours between the two pumps bystarting the pump with the least amount of run time. In case of pump failure, the MicroTech willstart the next pump.



Press the "NEXT MENU" key and menu 19 will be displayed. When cooling tower control is desired,up to four digital outputs may be used to stage multiple tower fans. An optional analog output isavailable for tower bypass valve control. Separate temperature set points are provided for eachcooling tower stage. The first tower stage is turned on when the entering condenser watertemperature exceeds the stage 1 set point. Subsequent stages are turned on when the time since thelast stage change exceeds the minimum stage up time. The number of stages will no be increasedabove the total number of tower stages defined in the cooling tower menu. The number of towerstages is decreased when the entering condenser water temperature drops below the current stage setpoint by more than the stage differential and the time since the last stage change exceeds the minimum

OM 200MICRO 31

stage down time. The number of stages also will be decreased when the maximum number of stages isless than the current stage.

The sequence described above allows stages to be turned on based on temperature only or on acombination of temperature and time. Control may be based only on temperature by setting the stage1 set point lowest and the other stages set points successively higher. This provides automatic resetof the condenser water as the tower capacity requirements increases. If a specific entering condenserwater temperature is desired at all times, the set points for all stages can be set to the same value andstaging is based on that temperature and the stage up and stage down timers.

Menu 19, Cooling Tower ControlItem

Screen Line Display Field Range Extended NameYes

Tower Control=Yes 1No

Tower Control1

Tower Stages=2 2 1-4 Total Cooling tower StagesStageUp time=2Min 1 2-60 Min Stage Up Delay

2StageDn Time=5Min 2 1-60 Min Stage Down Delay

1

3 Stage Differential=3.0°F 1 1-10°F Staging DifferentialStage #1 On=70.0°F 1 40-120°F Stage #1 Set pointStage #4 On=70.0°F 2 40-120°F Stage #4 Set pointStage #2 On=70.0°F 1 40-120°F Stage #2 Set point

2 1

Stage #3 On=70.0°F 1 40-120°F Stage #3 Set point

Tower Control= Set this value to 'yes' for fan staging control or by-pass valve control and 'no' ifcondenser water temperature is not controlled by the MicroTech.

Tower Stages= This value will determine how the MicroTech calculates the time to increase ordecrease the cooling tower controlling sequence. The number of stages refers to cooling tower fansor to bypass valve control.

Stageup Time= This value will delay the MicroTech from starting the staging control. This can beused to provide specific system control requirements.

Stagedn Time= This value will delay the MicroTech from staging down for the time specified. Thiscan be used to provide specific system control requirements.

Stage Differential= This value is the control band for the fan staging control logic. This value mustbe exceeded to stage up or down.

Stage #1 0n= This value determines when the first stage control will start. This value plus 1/2 thestage differential determines the control point value. This value is active on stage up and stage down.

Stage #2-4 0n= Same as Stage #1 On=.

Press the "NEXT MENU" key and menu 20 will be displayed. This menu will provide control of thecooling tower valve. If a bypass valve is to be used to provide a low limit for the tower, the valve setpoint should be set for the Valve Control method and the valve set point should be less than the fanstage 1 set point. In this situation, the number of cooling tower stages is increased only when thevalve position exceeds the maximum position set point so the valve is fully open to the tower whenany cooling tower stage is on. The entering condenser water temperature will vary as stages areturned on and off.

If a relatively constant entering condenser water temperature is desired, the valve set point should beselected as the Stage Control method. In this situation the valve is modulated to maintain the currentstage temperature set point. The number of cooling tower stages is increased only when the valveposition exceeds the maximum position set point and the temperature and time requirements describedabove for staging up are met. The valve will then modulate closed when the temperature starts todrop after the fan stage is added.

32 OM 200MICRO

The number of cooling tower stages is decreased only when the valve position drops below theminimum position set point and the temperature and time requirements described above for fanstaging down are met. The valve then modulates open as the temperature starts to rise after the fanstage is turned off.

When the chiller is commanded to start, and either type of valve control is selected, the bypass valveis positioned to anticipate the heat rejection needed at the time of startup. When condenser flow hasnot been confirmed, but the chiller is in the start requested state, the valve position is based on theminimum position, maximum position and Oat set points. If the optional outdoor air temperaturesensor is not installed, the valve position is determined solely by the minimum and maximum positionset points. If the maximum and minimum positions are set to the same value, the valve will always beset to that fixed position prior to start-up.

Menu 20, Tower Valve ControlItem

Screen Line Display Field Range Extended NameNone

Valve Set Point1 Valve Control=None 1Stage Set Point

Cooling Tower Bypass Ctrl Type

Valve Spt=65.0°F 1 40-99.5°F Bypass Valve Control Set Point2

Value Deadb=2.0°F 2 1.0-10.0°F Bypass Valve Control Dead BandMin Position=20% 1 0-50% For Calculating Valve Position

1

3Max Positon=80% 2 50-100% For Calculating Valve Position

NC to Tower1 Valve Type=NC 1

NO to TowerBypass Valve Default Position

Mod Limit=7.5°F 1 4.0-25.0°F Bypass Valve Modulation Limit2

Sample time=15Sec 2 15Sec-15Min Ent Cond Temp Integration TimeMax Change=4% 1 1-20% Max Allowable Valve Pos Change

2

3PA Time=15Min 2 1.0-60 Min Proj Ahead Calculation Window

Min Start Pos=0% 1 0-100% Min Valve Position at Startup1

Max Start Position=100% 2 0-100% Max Valve Position at StartupMin Pos At=60°F 1 0-99.5°F OAT for Minimum Position

32

Max Pos At=90°F 2 0-99.5°F OAT for Maximum Position

Valve Control= A value must be selected telling the MicroTech which type of control will be used forthe tower valve. If none is selected, the remaining values are not required for tower control.

Valve Spt= This value is the water temperature the MicroTech will maintain by modulating thetower valve.

Valve Deadb= This value is the control dead band that is used in the MicroTech when calculatingcontrol actions.

Min Position= This value is used in calculating when the valve position will change. The defaultvalues should be adequate for most applications.

Max Position= This value is used in calculating when the valve position will change. The defaultvalues should be adequate for most applications.

Valve Type= This value indicates the type of output (increasing or decreasing voltage) suppliedto the control valve controller. If the valve requires an 0-10 Vdc to open select the 'N/C' valve.The 'N/O' selection would provide a 0 Vdc for valve to be open and a 10 Vdc for the valve to befully closed.

Mod Limit= This value is used in MicroTech calculations and can increase or decrease thecontroller sensitivity.

Sample Time= This value determines how frequently the MicroTech looks at the watertemperature entering the condenser.

Max Change= The value limits the amount the valve position can change at one time.

PA Time= This value will reduce control point overshoot and produce quicker response to loadvariations.

OM 200MICRO 33

Min Start Pos= This value will control the minimum position of the valve during pre-start at a pre-selected (Min Pos At=) outside air temperature.

Max Start Pos= This value will control the maximum position of the valve during pre-start at apre-selected (Max Pos At=) outside air temperature.

Min Pos At= The outside air temperature associated with the Min Start Pos=.

Max Pos At= The outside air temperature associated with the Max Start Pos=.

Press the "NEXT MENU" key and menu 21 (Oil Set Points) will be displayed. Menu 21 has onescreen. This menu is password protected and requires the service password. These values are set bythe start up technician. Changing these values could cause compressor damage. The menu can bemonitored and set points compared to actual operating conditions.

Menu 21, Oil Set PointsItem

Screen Line Display Field Range Extended Name1 Feed Spt=100.0°F 1 90-190°F2 No Start Diff=40.0°F 1 30-60°F13 Htr On Diff=30.0°F 1 10-40°F

Oil Feed Set Point

Press the "NEXT MENU" key and menu 22 (Alarm Set Points) will be displayed. Menu 22 has sixscreens. This menu is password protected and requires the service password. These values are setby the start up technician. Changing these values could cause compressor damage. The menu can bemonitored and set points compared to actual operating conditions.

Menu 22, Alarm Set PointsItem

Screen Line Display Field Range Extended Name1 Low Evap Press-Shutdn 26.0psi 1 10-45psi2 Low Evap Press-Unload 31.0psi 1 10-45psi13 Low Evap Press-hold 38.0psi 1 10-45psi1 High Dsch Temp-Shutdn 190.0°F 1 120-240°F2 High Dsch Temp-Load 170.0°F 1 120-240°F

23

High Cond Press-Shutdn140.0psi

1 120-240psi

1 Motor Current threshold 10% 1 1-20%2 High Oil Feed Temp 140.0°F 1 120-150°F33 Low Oil Delta Temp 40.0°F 1 20-80°F1 Low Net Oil Press 50.0psi 1 40-60psi2 Low Dsch Sprht at Min RLA

15.0°F1 0-50°F

4

3High Dsch Sprht at Min RLA

70.0°F1 10-90°F

1 Low Dsch Sprht at Max RLA6.0°F

1 0-50°F

2High Dsch Sprht at Max RLA

25.0°F1 10-90°F

5

3Surge-Hi Suct Sprht-Starting

50.0°F1 25-90°F

1Surge-Hi Suct Sprht-Running

25.0°F1 5-45°F

2 Evap Water Freeze 34.0°F 1 -9 - 45°F6

3 Cond Water Freeze 34.0°F 1 -9 - 45°F

Press the "NEXT MENU" key and menu 23 (Lead Lag Setup) will be displayed. Menu 23 has twoscreens. This menu is password protected and requires the operator password. If 'master' is selectedin menu 26, screen two, then menu 23 is available on the master unit only. This relates to having anetwork consisting of two MicroTechs, and operating in a master/slave mode. The start up technicianwill set all values.

34 OM 200MICRO

Menu 23, Lead Lag SetupItem

Screen Line Display Field Range Extended NameSlave Address=01.00 1 00-09 Slave Unit Network Address

NoUnload1Start-Up=NotUnld 2

UnloadUnload Lead During Lag Start

AutoSlave LeadLL Mode=auto 1

Master LeadLead Lag Control Mode

2

Enable Lag=95% 2 0-100% Lag Start ThresholdN/ASunMonTueWedThuFri

LL SwOver=N/A 1

Sat

Scheduled Lead Unit SwitchOver Day

1

3

Disable Lag=40% 2 1-100% Lag Stop Threshold1 Delay timer=5Min 1 1-60Min Lag Unit time Delay

22 Lag-Standby=No 1 No-Yes Lag Unit Standby Operation

Slave Address= This value is the network address of the slave MicroTech. The wrong value willdisconnect the communications between the chillers and they would revert back to local control. Thiscould cause damage to a dual chiller unit. The slave address should be 01.01.

Start-Up= This value directs the lead chiller to unload or not to unload. A dual chiller must unload thelead chiller when starting the lag chiller. This is optional in a two (2) single chiller configuration.

LL Mode= The value selected will direct the network to start the chillers in a fixed sequence.

Auto—The chiller with the least run time will start as the lead unit. The chiller with the most runtime will turn off first when only one chiller is required to meet load conditions.

Slave Lead—The slave chiller will start first each time and the master chiller will shutdown whenonly one chiller is needed to meet load requirements.

Master Lead—The master chiller will start first each time and the slave chiller will shutdown whenonly one chiller is needed to meet load requirements.

Enable Lag= This is the amp value (percentage) when the lag chiller will be started. This value mustbe maintained for a predetermine amount of time to indicate a true load.

LL SwOver= Day of week for lead lag switch to occur.

Disable Lag= This is the amp value (percentage) when the lag chiller will be shutdown. This valuemust be maintained for a predetermine amount of time to indicate a true load.

Delay Timer= This value is used to delay the starting and stopping of the lag chiller. The maximumamps must be maintained for the period of the Delay Timer value before the lag chiller will start. Theminimum amps must be maintained for the period of the Delay Timer value for the lag chiller to stop.

Lag-Standby= This value sets the lag chiller as a standby chiller and will only start if the lead chillerfails.

Press the "NEXT MENU" key and menu 24 (Service) will be displayed. Menu 24 has three screens.This menu is password protected and requires the service password.

OM 200MICRO 35

Menu 24, ServiceItem

Screen Line Display Field Range Extended NameManual Load=Off 1 Off-on Enable Manual Loading

1Hot Gas Bypass=30% 2 20-70% Hot Gas Bypass Enable Setpoint

Setpoint=40% 1 0-100% Manual Load Setpoint2

Post Lube=15 2 10Sec-5Min Oil Pump Delay Off Time1 Normal

Timers=NormalFast

Setup Timers for Service

1

3Shtdn Vanes=30Sec 2 10Sec-5Min Maximum Shutdown Delay

1 Sun-Sat Auto Log Start Date1 00:00-23:59 Auto Log Start Time2 Sun-Sat Auto Log Stop Date

1 Auto Log Window

2 00:00-23:59 Auto Log Stop timeEvap Offset=0.0psi 1 -9.9psi - 15.0psi Evap Press Transducer

Califration2

Oil Feed=0.0psi 2 -9.9psi - 15.0psi Oil Feed Press TransducerCalifration

Cond Offset=0.0psi 1 -9.9psi - 15.0psi Cond Press TransducerCalifration

2

3Oil Vent=0.0psi 2 -9.9psi - 15.0psi Oil Vent Press Transducer

Califration

1Tower Bypass Valve=0mA/0VDC 1 0mA/0VDC -

4mA/1VDC/2VDCControls Output of AOX Board

2Mtr Current Input=0mA/0VDC 1 0mA/0VDC -

4mA/1VDC/2VDCInput signal Conditioner for Motor

Current3

3 Pump Down=No 1 No-Yes Pump Down on Stop

Press the "NEXT MENU" key and menu 25 (Service Testing) will be displayed. Menu 25 has fivescreens. This menu is password protected and requires the service password.

Menu 25, Service TestingItem

Screen Line Display Field Range Extended NameOutput #0=Off 1 Off-On Manual Output Control

1Output #3=Off 2 Off-On Manual Output ControlOutput #1=Off 1 Off-On Manual Output Control


1




2




3




4

3Output #23=Off 2 Off-On Manual Output Control

1 DI #0-7=00000000 1 Digital Input Status (0-7)2 DI #8-15=00000000 1 Digital Input Status (8-15)53 AI #19=0.0VDC 1 Analog Signal at Input 19 (Ref)

36 OM 200MICRO

Basic Chiller SetupPress the "NEXT MENU" key and menu 26 (Unit Setup) will be displayed. Menu 26 has threescreens. This menu is password protected and requires the operator password. Changing the valuesin this menu can cause network communications failure.

There are several menus that require resetting the default values for proper unit operation. The setupprocedure will be performed by the startup technician and the information should be recorded forfuture use. This following procedure will show how to setup a single compressor (WSC) stand-aloneunit without a network.

Set the toggle switch on the face of the MicroTech panel to the stop position. Press the "ALARM"key under the Category group. This brings up menu 27. Press the "PREV. MENU" key and menu 26will be displayed. Menu 26 should be the first menu to be modified because the information enteredaffects other menus. The following will be in the sequence displayed on the screen. The valuesentered will depend upon the unit and the information required should be obtained and recordedbefore an attempt is made at inputting the data.

Menu 26, Unit SetupItem

Screen Line Display Field Range Extended NameIDENT=CFG3E04I 1 Software Version

WSC048WSC050WSC063WSC079WSC087WSC100

1Unit Type=WSC063 2

WSC126

Chiller Model Number

L1-TTY-MasterL1-TTY-TTY

L2-Master-SlaveL2-TTY-Slave

Config=L2 TTY-Slave 1

L3-TTY-Slave

Unit Controller Configuration

Chiller

2

Chiller Only 2Templifier

Chiller Control Options

120024004800

Port A Baud =9600 1

9600

Port A Comm Rate

1

3

Low Temperature=No 2 No-Yes Ice OperationMaster

Master/Slave=Slave 1Slave

Network Configuration1

Evap Gpm Sensor=No 2 Yes-No Evaporator Flow TransmitterNoneLocalOAT Sensor=None 1

RemoteLocation of OAT

2

Evap Full Gpm=6500 2 0-65535 Maximum Flow RateAmbient Lockout=No 1 Yes-No Lockout on OAT

2

3Cond Gpm Sensor=No 2 Yes-No Condenser Flow TransmitterCond Full Gpm=6500 1 0-65535 Maximum Flow Rate

Valve1Oil Cooler=Solenoid 2

SolenoidOil Cooler Control Method

Refrig Leak Sen=No 1 Yes-No Refrigerant Leak Sensor Signal2

Full Load Amp=300 2 0-65535 Chiller RLA

3

3 Ht Recovery Sen=No 1 Yes-No Heat Recovery Temp Sensor

Unit Type= This value is the chiller unit model number. The MicroTech has different look up tablesdepending on the type of chiller.

Ident= This is the MicroTech software identification.

Config= This defines the network communication link, com port type and MicroTech controller level.The first field indicates the controller's network hierarchy. The second field indicates Port A'sprotocol. TTY is equal to the RS232 type and Master/Slave is equal to the RS 485 type.

Chiller= This value defines the chiller as a cooling only unit (only) or templifier unit.

OM 200MICRO 37

Port A Baud= This value defines the communication baud rate for port A. This is critical if there is anetwork. (Port A baud rate must be set to 9600 on the master unit.)

Low Temperature= This value selects the operational mode of the unit. If 'ice' is selected, theMicroTech default values have to be reset to match the system requirements for an "Ice" application.

Master/Slave= This defines the network relationship between the two MicroTechs. For lead/lagoperation, one controller must be set as the master and the other controller must be set as the salve.The master unit provides the control setpoints as long as the network is active. Menu 23 will beavailable only on the master unit.

Evap Gpm Sensor= 0ptional. This value defines if a flow sensor is present for the MicroTech tomonitor.

Oat Sensor= This value defines if an outside air sensor is present for the MicroTech to monitor anduse in the control decisions.

Evap Full Gpm= This value defines the full flow capabilities of the evaporator flow sensor. TheMicroTech scales the value linearly between 4 and 20 milliamp input or 0 to 10VDC input.

Ambient Lockout= This value determines (according to the outside air temperature) the point thatno chiller operation is needed.

Cond Gpm Sensor= 0ptional. This value defines if a flow sensor is present for the MicroTech tomonitor.

Cond Full Gpm= This value defines the full flow capabilities of the condenser flow sensor. TheMicroTech scales the value linearly between 4 and 20 milliamp input or 0 to 10 VDC input.

Oil Cooler= This value defines the type of oil cooler control valve and the type of control output theMicroTech will provide. Select solenoid for our standard solenoid and water regulating valvecombination. Select valve for the special optional electric relay type valve used in place of ourstandard arrangement.

Refig Leak Sen= 0ptional. This value defines if a refrigerant leak detector is present in the system.

Full Load Amp= This value must match the compressor label value indicating the RLAs of the chillerunit. Several control and safety functions reference this value.

Ht Recovery Sensor= This value defines if heat recovery sensors are present for the MicroTech tomonitor.

38 OM 200MICRO

Alarm Menus Description

Press the "ALARM" key under the 'Category Group' and menu 27 (Alarms) will be displayed. Menus27-35 are the alarm menus.

Menu 27 has four screens. This menu is a display and does not require a password. The valuesdisplayed indicate the current alarm and the conditions at the time the alarm reported. When anotheralarm reports the values in this menu will be shifted to menu 28 (Alarm Buffer #1). Each time anotheralarm reports the alarms are shifted and the alarm buffers #1-#8 (Menu 28-35) are filled. The oldestalarm will be removed from memory. This allows for the current alarm and eight (8) previous alarms tobe recorded for troubleshooting purposes.

Menu 27, Current AlarmItem

Screen Line Display Field Range Extended NameNo Active Alarms 1 Alarm Status Table Current Alarm

At 0:00 2 00:23-23:59 Time of Alarm1On N/A-00 3 Jan-Dec/01-31 Date of AlarmUnit Status 1 Alarm Status Table Unit Operating Mode at Alarm

2Ent Evap=xxx.x°F 2 Ent Evap Chw Temp at Alarm

Motor Current=xxx% 1 0-100% Percent RLA at Alarm

1

3Lvg Evap=xxx.x°F 2 Lvg Evap Chw Temp at AlarmEnt cond=xxx.x°F 1 Ent Cond Water Temp at Alarm

1Cond=xxx.xpsi 2 Cond Refrigerant Press at Alarm

Lvg Cond=xxx.x°F 1 Lvg Cond Water Temp at Alarm2

Evap Aprch=xxx.x°F 2 Evap Approach at AlarmEvap=xx.xpsi 1 Evap Refrigerant Press at Alarm

2

3Cond Aprch=xxx.x°F 2 Cond Approach at AlarmDischange=xxx.x°F 1 Discharge Temp at Alarm

1Subcool=xxx.x°F 2 Subcooling at Alarm

Dsch Suprht=xxx.x°F 1 Discharge Superheat at Alarm2

Sump Temp=xxx.x°F 2 Oil Sump Temp at AlarmSuct Suprhtxxx.x°F 1 Suction Superheat at Alarm

3

3Feed Tempxxx.x°F 2 Oil Feed Temp at Alarm

1 Feed Press=xx.xpsi 1 Oil Feed Pressure at Alarm2 Evap Flow=xxxxgpm 1 Evaporator Water Flow at Alarm43 Cond Flow=xxxxgpm 1 Condenser Water Flow at Alarm

Press the "NEXT MENU" key and menu 28 (Alarm Buffer #1) will be displayed. Menu 28 has fourscreens. This menu is a display and does not require a password. This is the first of eight alarmbuffers. The information displayed can provide troubleshooting information.

Menu 28, Alarm Buffer #1Item

Screen Line Display Field Range Extended NameNo Active Alarms 1 Alarm Status Table Current Alarm

At 0:00 2 00:23-23:59 Time of Alarm1On N/A-00 3 Jan-Dec/01-31 Date of AlarmUnit Status 1 Alarm Status Table Unit Operating Mode at Alarm

2Ent Evap=xxx.x°F 2 Ent Evap Chw Temp at Alarm

Motor Current=xxx% 1 0-100% Percent RLA at Alarm

1

3Lvg Evap=xxx.x°F 2 Lvg Evap Chw Temp at AlarmEnt cond=xxx.x°F 1 Ent Cond Water Temp at Alarm

1Cond=xxx.xpsi 2 Cond Refrigerant Press at Alarm

Lvg Cond=xxx.x°F 1 Lvg Cond Water Temp at Alarm2

Evap Aprch=xxx.x°F 2 Evap Approach at AlarmEvap=xx.xpsi 1 Evap Refrigerant Press at Alarm

2

3Cond Aprch=xxx.x°F 2 Cond Approach at AlarmDischange=xxx.x°F 1 Discharge Temp at Alarm

1Subcool=xxx.x°F 2 Subcooling at Alarm

Dsch Suprht=xxx.x°F 1 Discharge Superheat at Alarm2

Sump Temp=xxx.x°F 2 Oil Sump Temp at AlarmSuct Suprhtxxx.x°F 1 Suction Superheat at Alarm

3

3Feed Tempxxx.x°F 2 Oil Feed Temp at Alarm

4 1 Feed Press=xx.xpsi 1 Oil Feed Pressure at Alarm

OM 200MICRO 39

2 Evap Flow=xxxxgpm 1 Evaporator Water Flow at Alarm3 Cond Flow=xxxxgpm 1 Condenser Water Flow at Alarm

Follow the above sequence to view the alarm menu 29-35 (Alarm Buffers #2-#8).Press the "NEXT MENU" key and menu 36 (Alarm Output) will be displayed. Menu 36 has onescreen. This menu is password protected and requires the operator password. Menu 36 controls howthe alarms are reported through the alarm relay. The alarm relay is the interface to most buildingautomation systems or alarm device such as a bell or light.

Alarms are categorized into three different types. The alarms are defined as warnings, problems andfaults. A warning is a pre-alarm condition and an indication of a potential problem. Problems arealarms that the MicroTech will cause a control modifications in an attempt to correct the problem.Faults are alarms that cause an immediate system shutdown to protect the chiller and its components.

Menu 36 controls the reporting of these alarms via the alarm relay. Use this menu to have only thealarms report that are necessary for your system.

Menu 36, Alarm OutputScreen Line Display Field Range Extended Name

OpenAlarm-Normal=Open 1

CloseFastSlow

Close

1Problems=Fast 2

OpenFast

Comm Loss=Slow 1SlowFastSlow

Close

2Faults=Close 2

OpenFastSlow

Close

1

3 Warnings=Slow 1

Open

Alarm Reporting and Control ofAlarm Relay

Alarm-Normal= This value defines how the alarm contact will be in its normal (non alarm) position.Normally open or normally closed. All alarms as they report will cause the alarm output to close oropen depending on this setting.

Problems= This value will define how problems will report (open/close) or how (fast/slow) thereporting will occur. Only one can be selected. If fast/slow is selected the alarm contact logic willfollow the 'Alarm-Normal' value selected. Problem alarms are self-clearing but will be recorded into thealarm buffers. Problems are defined as conditions where the MicroTech will try corrective actions toavoid unit shutdown. Example, high head pressure. The MicroTech would unload the compressor toa point where the head pressure was in an acceptable range.

Comm Loss= This value must be set if a network exists. This value will define how the 'Com Loss' willreport (open/close) or how (fast/slow) the reporting will occur. Only one can be selected. If fast/slowis selected the alarm contact logic will follow the 'Alarm Normal' value selected.

Faults= This value will define how faults will report (open/close) or how (fast/slow) the reporting willoccur. Only one can be selected. If fast/slow is selected the alarm contact logic will follow the 'AlarmNormal' value selected. Fault alarms require manual clearing and will cause immediate shutdown of theunit. Faults should be investigated before clearing and allowing the unit to restart.

Warnings= This value will define how warnings will report (open/close) or how (fast/slow) thereporting will occur. Only one can be selected. If fast/slow is selected the alarm contact logic willfollow the 'Alarm-Normal' value selected. Warning alarms are self-clearing but will be recorded intothe alarm buffers.

Press the "NEXT MENU" key and menu 37 (Message Board) will be displayed. Menu 37 has onescreen. This menu allows a technician to post a message via a computer. A message could be postedby a remote computer using the modem.

40 OM 200MICRO

Menu 37, Message BoardItem

Screen Line Display Field Range Extended Name

1 1 No MessageA Message can be Posted via a

Connected Computer

OM 200MICRO 41

Master/Slave Setup

Chiller setup for dual unit (WDC) or two single (WSC) units with master/slave and or lead/lag control.There are several menus that require modification to accomplish this setup. The first menu that has tobe modified is menu 26. One MicroTech controller has to be designated as the Master unit. The otherunit will be the Slave unit.

Set the toggle switch on the face of the MicroTech panel (master and slave units) to the stopposition. Go to menu 26 on the Master unit. Only the values that require changes will be discussed.

Menu 26, Unit SetupItem

Screen Line Display Field Range Extended NameIDENT=CFG3E02AC 1 Software Version

WSC048WSC050WSC063WSC079WSC087WSC100

1Unit Type=WSC063 2

WSC126

Chiller Model Number

L1-TTY-MasterL1-TTY-TTY

L2-Master-SlaveL2-TTY-Slave

Config=L2 TTY-Slave 1

L3-TTY-Slave

Unit Controller Configuration

Chiller

2

Chiller Only 2Templifier

Chiller Control Options

120024004800

Port A Baud =9600 1

9600

Port A Comm Rate

1

3

Low Temperature=No 2 No-Yes Ice OperationMaster

Master/Slave=Slave 1Slave

Network Configuration1

Evap Gpm Sensor=No 2 Yes-No Evaporator Flow TransmitterNoneLocalOAT Sensor=None 1

RemoteLocation of OAT

2

Evap Full Gpm=6500 2 0-65535 Maximum Flow RateAmbient Lockout=No 1 Yes-No Lockout on OAT

2

3Cond Gpm Sensor=No 2 Yes-No Condenser Flow TransmitterCond Full Gpm=6500 1 0-65535 Maximum Flow Rate

Valve1Oil Cooler=Solenoid 2

SolenoidOil Cooler Control Method

Refrig Leak Sen=No 1 Yes-No Refrigerant Leak Sensor Signal2

Full Load Amp=300 2 0-65535 Chiller RLA

3

3 Ht Recovery Sen=No 1 Yes-No Heat Recovery Temp Sensor

Config= This defines the communication link, com port type and MicroTech controller level. Themaster unit must be set to L2-Master-Slave. This setting makes menu 23 available only on the masterunit. (The slave unit must be set to L3TTY-Slave).

Master/Slave= Set this to 'Master' on the Master unit. (Set this value to 'Slave' on the slave unit).

This completes the setup of menu 26 on both the master and slave units.

Go to menu 23 on the master unit. This menu is only available on the master unit. The networkcommunications depends on the values selected in this menu.

42 OM 200MICRO

Menu 23, Lead Lag SetupItem

Screen Line Display Field Range Extended NameSlave Address=01.00 1 00-09 Slave Unit Network Address

NoUnload1Start-Up=NotUnld 2

UnloadUnload Lead During Lag Start

AutoSlave LeadLL Mode=auto 1

Master LeadLead Lag Control Mode

2

Enable Lag=95% 2 0-100% Lag Start ThresholdN/ASunMonTueWedThuFri

LL SwOver=N/A 1

Sat

Scheduled Lead Unit SwitchOver Day

1

3

Disable Lag=40% 2 1-100% Lag Stop Threshold1 Delay timer=5Min 1 1-60Min Lag Unit time Delay

22 Lag-Standby=No 1 No-Yes Lag Unit Standby Operation

Slave Address= This value (01.01) is the network address of the slave MicroTech. This value isdetermined by the Hex switches on the MicroTech. The slave MicroTech will always be addressed as01. The master unit can be any hex switch setting greater that 00 but less that FF. (00 & FF arereserved numbers and cannot be used.) The wrong value will disconnect the communicationsbetween the chillers and they would revert back to local control. This could cause damage to a dualchiller unit.

Start-Up= This value directs the lead chiller to unload or not to unload. A dual chiller must unload thelead chiller when starting the lag chiller. This is optional in a two (2) single chiller configuration.

LL Mode= The value selected will direct the network to start the chillers in a fixed sequence.

Auto—The chiller with the least run time will start as the lead unit. The chiller with the most runtime will turn off first when only one chiller is required to meet load conditions.

Slave Lead—The slave chiller will start first each time and the master chiller will shutdown whenonly one chiller is needed to meet load requirements.

Master Lead—The master chiller will start first each time and the slave chiller will shutdown whenonly one chiller is needed to meet load requirements.

Enable Lag= This is the amp value (percentage) when the lag chiller will be started. This value mustbe maintained for a predetermine amount of time to indicate a true load.

LL Swover= Day of week for lead lag switch to occur. This is optional.

Disable Lag= This is the amp value (percentage) when the lag chiller will be shutdown. This valuemust be maintained for a predetermine amount of time to indicate a true load.

Delay Timer= This value is used to delay the start of the lag chiller if the lag chiller is used in a standby mode only. Stand by means the chiller is only started when the lead chiller fails.

Lag-Standby= This value sets the lag chiller as a standby chiller and will only start if the lead chillerfails.

Cycle power to both MicroTech controllers. This is necessary for the hex switch settings and comport settings initialization.

Go to menu 11. Set Auto:Network in this menu for both the slave and master MicroTech. Set thetoggle switch on the face of the MicroTech panel (master and slave units) to the auto position. Thechillers will now start when load conditions require cooling.

OM 200MICRO 43

Alarms

Any condition that requires corrective action by the controller that overrides normal chiller operationor any condition that initiates an emergency chiller shutdown can be considered to be an alarm.

Alarms are arranged in increasing priority with higher priority alarms replacing any lower priorityalarms that may exist. Once the abnormal condition is corrected, the alarm may be cleared by pressingthe "CLEAR" key.

Alarms fall into three distinct categories: Warnings, Problems, and Faults.

WarningsA warning is enunciated whenever an abnormal condition exists which does not affect chilleroperation.

WARNING CONDITION DISPLAY

Liquid Line RefrigerantTemperature Sensor Fall Warning

Sensor is shorted or open Liq Line T Sen Warn

Entering Evaporator WaterTemperature Sensor Fall Warning

Sensor is shorted or open Ent Evap T Sen Warn

Leaving Condenser WaterTemperature Sensor Fail Warning

Sensor is shorted or open Lvg Cond T Sen

Low Discharge SuperheatDischarge Superheat temperatureis lower than acceptable range formore than 3 minutes (adjustable)

Low Disch Superheat

High Discharge SuperheatDischarge Superheat temperatureis lower than acceptable range formore than 3 minutes (adjustable)

Hi Disch Superheat

ProblemsA problem condition exists whenever the MicroTech controller must override normal chiller operationin order to keep the unit on line.

PROBLEM CONDITION DISPLAY ACTION CLEAR

Entering EvaporatorWater TemperatureSensor Fail Problem

Sensor is shorted oropen and Leaving Water

reset is based onEntering WaterTemperature

Ent Evap T Seen ProbeLeaving Water reset will

change to No Reset

Manual - Reset willrevert back to Entering

Water on clearing

Outside Air TemperatureSensor Fail Problem

Sensor is shorted oropen and Leaving Water

reset is based onOutside Air Temperature

Outside T Seen ProbeLeaving Water reset will

change to No Reset

Manual - Reset willrevert back to OAT on

clearing

Low EvaporatorPressure - Inhibit

Loading

Sensor Pressure is lessthen low limit (38 psig)

Lo Evap Press-NoLoad Inhibit loading

Automatically when:Evaporator Pressurerises above set point

plus differential

Low Evaporator pressure- Unload

Evaporator Pressure isless then low limit (31

psig)Low Evap Press-Unload

Unload to minimumposition

Automatically when:Evaporator Pressurerises above set point

plus differential

High DischargeTemperature - Load

Discharge temperature> high limit (120°F) andSuction Superheat < Low

Limit (15°F)

High Discharge T-Load Load compressor

Automatically when:Discharge Temperature< High Limit - Diff (3°F)or Suction Superheat >Low Limit + Diff (3°F)

Condenser FreezeProtect

Condenser RefrigerantTemperature <

Condenser FreezeProtect Set Point (34°F)

Cond Pres Lo-FreezeStart the Condenser

pump

Condenser RefrigerantTemperature >

Condenser FreezeProtect Set Point +Differential (2°F)

44 OM 200MICRO

Problems, continuedPROBLEM CONDITION DISPLAY ACTION CLEAR

Evaporator FreezeProtect

Evaporator RefrigerantTemperature <

Evaporator FreezeProtect Set Point (34°F)

Evap Pres Lo-FreezeStart the Evaporator

pump

Evaporator RefrigerantTemperature >

Evaporator FreezeProtect Set Point +Differential (2°F)

Evaporator Pump 1 Fail

UnitStatus >EvapPmpOn_Recirc and

UnitStatus <EvapPumpsOff and

Evaporator Water Flowswitch digital input in NoFlow position for more

then 3 seconds(adjustable) and

Evaporator pump 2 ispresent and Evaporator

pump 2 has not yetfailed

Evap Pump #1 FailUnit will try to startevaporator pump 2

Manual

Evaporator Pump 2 Fail

UnitStatus >EvapPmpOn_Recirc and

UnitStatus <EvapPumpsOff and

Evaporator Water Flowswitch digital input in NoFlow position for more


Evaporator pump 1 ispresent and Evaporator


Evap Pump #2 FailUnit will try to startevaporator pump 1

Manual

Condenser Pump 1 Fail

UnitStatus >CondPmpOn_WaitingFor Flow and UnitStatus <

CondPumpOff andCondenser Water Flow

switch digital input in NoFlow position for more


Condenser pump 2 ispresent and Condenser


Cond Pump #1 FailUnit will try to startcondenser pump 2

Manual

Condenser Pump 2 Fail

UnitStatus >CondPmpOn_WaitingFor Flow and UnitStatus <

CondPumpOff andCondenser Water Flow

switch digital input in NoFlow position for more


Condenser pump 1 ispresent and Condenser


Cond Pump #2 FailUnit will try to startcondenser pump 1

Manual

OM 200MICRO 45

FaultsThe chiller will be shut down by the MicroTech control panel in response to any of the following faultconditions. These faults must be cleared manually to restart the unit.

FAULT CONDITION DISPLAY

Low Evaporator Pressure Evaporator Pressure is less than low limit (26 psig) Lo Evap Pressure-SD

Low Oil Delta Pressure

Oil Pump output has been energized for more then30 seconds and Oil Feed Pressure is less than theEvaporator Refrigerant Pressure by more than the

alarm set point (30 psi)

Lo Evap Pressure-SD

Low Oil Feed TemperatureOil Feed temperature is less than Evaporator

Refrigerant Temperature plus Low Oil delta Spt(30°F) for greater than 1 minute (adjustable)

Low Oil Feed Temp

High Oil Feed TemperatureOil Feed temperature is greater than high limit(140°F) for greater than 1 minute (adjustment)

High Oil Feed Temp

Low Motor CurrentMCR has been energized for more than 30 seconds

and Motor Current is less than low limit (10%)Low Motor Current

High Motor CurrentMCR has been de-energized for more than 30

seconds and Motor Current is greater than shutdownlimit (10%)

High Motor Current

High Discharge Line Temperature Discharge Temperature is > Set Point (190°F) Hi Disch Line Temp

High Condenser PressureCondenser Pressure is greater than high limit (140psi) or High Cond Pressure digital input in Alarm

positionHi Condenser Press

Mechanical High Pressure Switch High Pressure digital input in Alarm position Mech Hi Pres Switch

High Motor TemperatureMotor High Temperature digital input in Alarm

positionHigh Motor Temp

High Suction Superheat Suction Superheat temperature > Set Point (50°F) Hi Suction Superht

No Starter TransitionMCR has been turned on more than 15 secondsand Starter Transition digital input is not in Delta

positionNo Starter Transition

No Evaporator Water Flow Fault

UnitStatus > EvapPmpOn_Recirc and UnitStatus <EvapPmpsOff_Shutdn and Evaporator Water Flow

switch digital input in No Flow position for more than3 second (adjustable)

No Evap Water Flow

No Condenser Water Flow Fault

UnitStatus > CondPmpOn_WaitingForFlow andUnitStatus < CondPmpsOff_Shutdn and CondenserWater Flow switch digital input in No Flow position

for more than 3 seconds (adjustable)

No Cond Water Flow

Starter FaultMCR Output energized and Starter Fault digital input

in Alarm positionStarter Fault

No 5Vdc at sensor #19 Analog sensor #19 value is < 213 or > 252 counts No 5Vdc at Sen #19

Leaving Evaporator Water TemperartureSensor Fail

Sensor is shorted or open Lvg Evap T Sen Fail

Evaporator Pressure Sensor Fail Sensor is shorted or open Evap Press Sen Fail

Entering Condenser Water TemperatureSensor Fail

Sensor is shorted or open Ent Cond T Sen Fail

Suction Temperature Sensor Fail Warning Sensor is shorted or open Suction T Sen Fail

Discharge Temperature Sensor Fail Sensor is shorted or open Discharg T Sen Fail

Condenser Pressure Sensor Fail Sensor is shorted or open Cond Press Sen Fail

Oil Feed Temperature Sensor Fail Sensor is shorted or open Oil Feed T Sen Fail

Oil Sump Temperature Sensor Fail Sensor is shorted or open Oil Sump T Sen Fail

Post Office Box 2510, Staunton, Virginia 24402-2510 • (800) 432-1342 • www.mcquay.com

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